Tax Basis and the Two Kinds of Wealth

What is a Basis in terms of taxes?

Basis is the tax system's record of what has already been taxed in an asset. At death, assets held in a taxable account generally have their basis reset to current value — erasing the unrealized gain that built up during life — while tax-deferred retirement accounts get no such reset, because every dollar in them is income that was never taxed.

Where basis sits in the tax planning system

Basis marks the line between what has been taxed and what has not. A taxable asset was bought with after-tax dollars; only its appreciation is untaxed, and at death that appreciation is reset away. A tax-deferred account was never funded with after-tax dollars — all of it is untaxed income — so there is no basis to reset, and the full ordinary-income character carries through to the heir.

Two accounts of identical value, one taxable and one tax-deferred, look the same on a statement and behave very differently for an heir. This is the transfer-side face of the asymmetry between a deferred balance and an after-tax balance.

What it is not

• The reset is not a universal rule for every inherited asset, and it does not make all inherited assets income-tax-free.

• It is not a loophole — it is a deliberate feature of the system.

• It does not apply to a tax-deferred account, whose dollars were never taxed.

• A reset asset is not tax-free forever — only the gain built up before death is erased; later appreciation is taxable when the heir sells.

• The reset does not turn pre-tax account dollars into after-tax dollars.

• A balance-sheet value is not the same as after-tax transferable wealth; being clear of the transfer tax does not mean being clear of income tax.

The trade-offs

• A taxable account costs after-tax dollars to build and is taxed along the way, and its built-up gain is forgiven at death.

• A tax-deferred account offers a contribution and growth advantage during life, and its embedded ordinary-income obligation rides through death without a reset.

• Two balances of equal size can mislead when their tax character is ignored, and reading them in after-tax terms reveals the difference.

Common emotional responses

The reset can feel like rare good news, paired with anxiety that a future law could remove it. The absence of an equivalent break for diligent pre-tax savers can feel unfair.

And there is confusion, often discovered late, that two equal balances are not equal after tax. These reactions are understandable.

When this applies

Most relevant for households holding both taxable and tax-deferred wealth, those with highly appreciated taxable assets, and those trying to reconcile a balance-sheet figure with true after-tax value.

Less central for low-appreciation holdings, all-tax-deferred households, or near-term spousal situations.

Common questions

What is a basis “step-up,” and how does it work?

When certain assets in a taxable account are inherited, their tax basis resets to the value at death, so the gain that built up during the owner's life is erased and an immediate sale would show little or no taxable gain.

Does the reset apply to my retirement account?

No. A tax-deferred account holds dollars that were never taxed, so there is no basis to reset; the heir owes ordinary income tax as the money comes out.

Why do taxable accounts get this and retirement accounts don't?

The reset is built for assets bought with already-taxed dollars; a tax-deferred account was funded with untaxed dollars, so the income tax is still owed.

If my heir inherits my stock and sells it right away, is there tax?

Generally not on the gain that built up before death, because the basis reset erases it; gain after death is taxable when sold.

What does it mean that a retirement account is “income in respect of a decedent”?

It means the account holds income the owner earned but never recognized; it gets no reset and is taxed to the heir as it is received.

Does my home or other real estate get the reset?

Real estate held in a taxable form generally does; the same asset held inside a retirement account does not.

Could the reset be taken away?

It is current law, but it is a policy setting; proposals to change it have been raised before, so it is a legislative risk rather than a guarantee.

Why does it matter which assets I spend and which I leave?

Because the two kinds of wealth pass to heirs very differently after tax, the choice of what to consume during life and what to leave changes how much actually reaches them.